static files aren't served in the right path when using SHIORI_HTTP_ROOT_PATH

Data

• Shiori version: 1.8.1-next (build 9a9a426acaca0e57e205bf20266a44954aaa8264)
• Operating system: linux

Describe the bug / actual behavior

when using --webroot /shiori/ or SHIORI_HTTP_ROOT_PATH=/shiori/, shiori keeps serving static files under /assets/ instead of /shiori/assets/, this results in a white blank screen when trying to connect to shiori as it fails to load stylesheets and js files

Expected behavior

when using --webroot /shiori/ or SHIORI_HTTP_ROOT_PATH=/shiori/, /shiori/assets/css/style.css should serve a stylesheet

To Reproduce

Steps to reproduce the behavior:

1. run shiori serve --address <host> --port <port> --webroot /shiori/ or equivalently SHIORI_HTTP_ROOT_PATH=/shiori/ shiori serve --address <host> --port <port>
2. open a browser and connect to http://<host>:<port>/shiori/
3. you should see a blank white screen
4. open a browser and connect to http://<host>:<port>/shiori/assets/css/style.css
5. you should see a blank white screen
6. open a browser and connect to http://<host>:<port>/assets/css/style.css
7. you should see a stylesheet

Screenshots

Notes

I don't know any go but it seems like GET /assets/ requests don't get routed properly when using --webroot, hardcoding the webroot in the static file routing/handling logic seems to fix it:

diff --git a/internal/http/handlers/frontend.go b/internal/http/handlers/frontend.go
index 280d3f5..2170274 100644
--- a/internal/http/handlers/frontend.go
+++ b/internal/http/handlers/frontend.go
@@ -50,5 +50,5 @@ func HandleAssets(deps model.Dependencies, c model.WebContext) {
 	if deps.Config().Http.ServeWebUIV2 {
 		fs = webapp.Assets
 	}
-	http.StripPrefix("/assets/", http.FileServer(newAssetsFS(fs, deps.Config().Http.ServeWebUIV2))).ServeHTTP(c.ResponseWriter(), c.Request())
+	http.StripPrefix("/shiori/assets/", http.FileServer(newAssetsFS(fs, deps.Config().Http.ServeWebUIV2))).ServeHTTP(c.ResponseWriter(), c.Request())
 }
diff --git a/internal/http/server.go b/internal/http/server.go
index 8f77f68..492b25d 100644
--- a/internal/http/server.go
+++ b/internal/http/server.go
@@ -97,7 +97,7 @@ func (s *HttpServer) Setup(cfg *config.Config, deps *dependencies.Dependencies)
 			handlers.HandleFrontend,
 			globalMiddleware...,
 		))
-		s.mux.HandleFunc("GET /assets/", ToHTTPHandler(deps,
+		s.mux.HandleFunc("GET /shiori/assets/", ToHTTPHandler(deps,
 			handlers.HandleAssets,
 			globalMiddleware...,
 		))